Portable electric tool-driving machine



. May 14, 1929. P, J, MOORE 1,713,444

PORTABLE ELECTRIC TOOL DRIVING cam:

Filed May 29,. 1928 s Shets-Sheet 1 o o J6 BY org May 14, 1929. P. J.MQORE v PORTABLE ELECTRIC TOOL DRIVING MACYI INE Fil ed may 29, 1928 sSheets-Sheet 2 INVENTOR. v

,PJMoore ATTORNEY May 14, 1929. P. J. MOORE PORTABLE ELECTRIC TOOLDRIVING IACHINE Filed May 29, 1928 v 3 sheets -sheet 3 INVENTOR. ,P.LIMOOYQ WM 42m A TTORNEYJ Patented May 14', 1929.-

rarnicx J. moon or BUTTE, momma.

PORTABLE EECTRIC TOOL-DRIVEN G MACHINE.

7 Application filed Kay 29,

The present invention relates to improye ments in portable electric tooldr ving machines, and has for an object to provide an improved machine,of a compact, inexpensive form capable of operating shears, rotatingvsandstones, clothes brushes, screens for powders-and seeds and a varietyof other implements.

Another object of the invention is to so constructthe machine as to makerovision fol-detaching one of the-driven implements and substitutinganother.

,A further object of the invention is to provide for the properdisposition of the electric cable to the motor whereby. not to interferewith the portability of the machine, and its free movement in theapplication of the tool to the work.

\Vith the foregoing and other objects inview, the invention will be morefully described hereina'fter, and will'be more particularly pointed outin the claims appended hereto.

In the drawings, wherein like symbols refer to like or correspondingparts throughout the several views,

Figure 1 .is a side elevation of an improved machine constructedaccording to the present invention.

Figure 2 is a similar view taken from the op osite side.

igure 3 is a top plan view of the frame of the device.

F igu'r'e 4 is a top plan view of the machine with parts broken away.

Figure 5 is an enlarged cross sectional view taken on the line 5-5 inFigure 4.

Figure 6 is a fragmentary perspective view showing the joint betweentheframe and removable tool arts.

Figure 7 is also a ragmentary perspective view showing the parts separaFigure 8 is a fragmentary perspective view showing 'the substitution onthe machine of a grinding or other roller.

Figure 9'is a similar view showing the application to the machine of arotary brush, an I Figure 10 is also a fragmentary perspective view withthe parts shown disassembled and illustrating-the application. of asifting device.

Referring more particularly to the drawings 11 and 12 representrespectively the.

fixed and movable blades of a pair of s ears. The lower fixed blade 11is shown as extend- 1928. Serial No. 281,558.

ing in a forward upwardlyinclined direction while the upphr blade 12 ispivoted at the base of the upright 13 which sup orts, and

may form a part of, the lower fixe blade 11. y

The two blades are thus carried by the upright 13 which in turn isprovided with the horizontal shank 14 adapted to detachably fit upon theportable machine.

Figures 6 and 7 show the preferred form of joint. In-these figures, theshank .14 is shown as having at its free end a lateral portion 15removed; and projecting sidewise from the face of the removed portion 15is a lug 16,preferably square in cross sectionfor cooperatin with asimilarly formed opening 17 in the cooperating frame shank 18. The end19 of this shank is bev'"- eled and fits against a beveled shoulder 20on the tool shank 14.

This beveled arrangement assists in supporting the tool from the machineframe.

A clamp, such as shown in Figure 6, is'

adapted to be fitted over the joint to hold the parts againstseparation. This clamp is composed of the top portion 21, the sides orlegs 22 and 23 and the dome or handle The legs 22 and 23 are adapted tostraddle the joint, as shown in Figures 1 and4. In this position theclamp may beheld frictionally or by other appropriate means. Whenliftedoil, the tool may be removed by sliding the shank 14 laterally, asindicated in Figure 7 and another tool having its own shank may besubstituted.

The frame shank 18 is carried by a post or standard 25. This ost iserected on the forward end of one o the spaced parallel frame bars 26.The opposite frame bar is indicated at 27. These frame bars areconnected together by the cross bars 28 and 29 which are perforated orotherwise formed to receive the screws 30 or other fastenings b whichthe base of the electric motor 31 1s secnred t'o the frame. The crossbars 28 and 29 are set inwardly from the ends of the longitudinal bars26, and 27; and the post 25 is carriedby the forward extension of one ofthe frame bars 26. This forward extension also carries an inwardly andlattrally with a rearwardly extending bar 36 from which rises a standard37 carrying the rearwardl" projecting handle 38.

The pa ey bf themotor is shown at 39 and its belt at .40. Thisbeltengages over the-driven pulley 4l having at one side'the eccentric pm 42for the connection to the link 43, saidlinkbeing also pivotally coupledto the tail piece '44 of the movable scissors blade 12.

The .pulley 41 is mounted on ashaft 45,

"one end of which is fixed in the vertical por tion 46 of an'anglebracket having a horizontal portion; and beneath the shaft 45. Thishorizontal portion 47 formed with the down-turned edge 48 which extendsagainst the tool shank u the shaft.45 is supported the-verticel shown at54.

' tricity.

14 to-which it may be secured by ing is a second opening 5 r is adaptedtov be engaged screws 'or pp bearing block 49 for the outerend o f uponthe shank 14 and between'this bea g part 46 of'the bracket is disposed a0011 spring 50 which surrounds the shaft 45 and takes up the end thrustor play. A washer 51 may be interposed between the bearing block 49 andthe pulley 41.

A washer 52 and nut 53 are shown used to hold the pulley 41 on the shaftThe electric current' wires to the motor bther appropriate fastenings. Amg as .45. are These wires extend. up through an'op'ening 55,- shown inFigure 3 asbeing made in an extension plate 56 of the frame opposite tothis stud 32-. In this extension plate 56 and alo side the opentoreceive and support the-lower, end of the bracket standard- 58, shown inFigures 4 and 5. r The upper end of this standard at one side carries aclamp ring 59 for. receiving a plug or wire coupling. The bracketstandard 58, which is preferably made from wire. is bent away from thering .59 into an arm 60 having an upturned endz61 terminating in oneormore convolutionsv 62 forming a ring-through which the wires,indicated at 63 from'th'e-plugpass to the source pf-elec- Ili'Fig'ures 8to 10 there is shown several other implements which may replace theshears. For instance in Figure, 8 there is shown a grinding or polishingwheel64 having associated therewith a.- pulley 65 which by the belt 40.

The pulley 65 and grinding wheel 64 are carried by the shank 14, whichshank is constructed-as a complement to the. shank 18 of the machineframe.

In- Figure 9 a brush 66is shown associated with a pulley 67 fordrivi'ngfthe same through the belt 40.. In this the shank 1 4 carriesthe brush and pulley and is construc jd with'the same form of jointshownin Figures 6 and 7.

In Figure 10 the shank 14 1s shown as shaft in order to retain the drumin place.

extending parallel with block 49 and having the pulley 68 mounted on theshaft 69 which 'is, adapted to' receive the hollow sifting drum"70,".the drum being'provided with square openings 71 in its heads orends to receive the square shaft 69 in order to lock the drum to theshaft "and cause the, rotation of the -drum when the pulley- 68 is beingdriven. A nut 72 is adapted to'be secured. onto. the threaded end 73, ofthe 75 The drum isprovided with a perforated' periphery 74 through whichpowder, seed'or. other material may be scattered. In the use .of thedevice, the machine. is held in one hand b grasping the handle 38. Themachine is b 'anced on'the single sup- .portmg wheel 34which'minimizes-the friction and the effort spend'to propelthe ma chine.The wires-from the house current-or other source are so i osed in thesupport ing bracket that they can be kept. clear. .of the machine duringits movement, The machine is pushed-with the shears or other implements,suchas shown in' Figures 8, 9 and 10,- moving in advance, r.As themachine progresses, the electric motor 31' will drive the shearsor'rotate the wheel, brush or sifting device. -A c can readily-be madefrom one-tool to t e'other b first lifting the clamp 21' andlaterallyshi K the shank 14 away from the -companion shank 18; Thebelt'can now be removed from the pulley and the new] part substituted.

vThe shank of the other tooLis then substi tuted in its place, the clamp21' replaced and the belt 40 or another belt fitted to theelec tricmotor and to the drive wheel of the pulley. The tension on the spring 50maybe regulated by rotating the nut 53 in one or the other direction. Itis as be understood that other. forms of tools may be used than thoseillustrated. The circular stone 64, shown in Figure 8, may be used forremoving rust from'metal surfaces and the machine for this reason beextremelyuseful to automobile ainters. The machine is inex-. pensive inat a single motor sufiiees ,for

. operating a great variety of tools and. the

. use of havmg 231i tool is avoided.

Itis obvious that various changes. and modifications may be made in thedetails of, construction'and. design of-the above specificallyfdescribedembodiment ofthis" invention'mthout departing from thespirit thereof,such changes and modifications being restricted onlyby the scope pf thefollowing claims. i

What claimed is 1. A portable electric tool driving machine comprising amovable frame, a motor thereojn, a shank on'theiframe having abeveledand cut awayend portionwith' a non-circular perforation laterallytherethrough, a tool driven byZthemotor and having 9' shank a completemachine for with a cut awa end portion having a beveled shoulder ajacent thereto and a non-circular lug for fitting in the opening in theframe shank portion, and aclamp for fitting about said shanks at theirjuncture to prevent lateral separation thereof.

2. A portable electric tool driving machine comprising a movable frame,a motor thereon, a tool carried b the frame, a shaft, a bracket on thetool xedly carrying one end of the shaft, a coil spring about the shaft,a

bearing block extending about the shaft and resting on the tool, andconnections between the motor and said shaft for driving the tool.

3.- A portable electric tool driving machine comprisin a movable frame,a motor thereon, a tool aving a shank removably carried by said frame,an an le bracket carried by said shank and offset inwardly, ashaft-having one end fixed to said bracket, a bearing block supported onthe shank and receiving theother end of said shaft, a coil spring woundabout said shaft between the bracket and bearing block, a pulley mountedon said shaft outwardly of the bearing block, means for retaining thepulley on the shaft and for adjusting the tension of said coil spring,and a belt connection between said motor and pulle y PATRICK J. MOORE.

